Research article
Estimating the mean and variance from the median, range, and the size of a sample
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* Corresponding author: Iztok Hozo ihozo@iun.edu
1 Indiana University Northwest, Department of Mathematics, Gary, IN, 46408 USA
2 Interdisciplinary Oncology Program, H. Lee Moffitt Cancer Center and Research Institute at the University of South Florida, Tampa, FL, USA
BMC Medical Research Methodology 2005, 5:13 doi:10.1186/1471-2288-5-13
Published: 20 April 2005Additional files
Additional File 1:
Normal distribution. The top row of the table displays the results of estimating the mean, while the second row displays the results of estimating the standard deviation. Each number in this table represents the average relative error of 200 samples from a Normal distribution.
Format: PDF Size: 67KB Download file
This file can be viewed with: Adobe Acrobat Reader
Additional File 2:
Log-Normal distribution. The top row of the table displays the results of estimating the mean, while the second row displays the results of estimating the standard deviation. Each number in this table represents the average relative error of 200 samples from a Log-Normal distribution.
Format: PDF Size: 69KB Download file
This file can be viewed with: Adobe Acrobat Reader
Additional File 3:
Beta Distribution. The top row of the table displays the results of estimating the mean, while the second row displays the results of estimating the standard deviation. Each number in this table represents the average relative error of 200 samples from a Beta distribution.
Format: PDF Size: 70KB Download file
This file can be viewed with: Adobe Acrobat Reader
Additional File 4:
Exponential Distribution. The top row of the table displays the results of estimating the mean, while the second row displays the results of estimating the standard deviation. Each number in this table represents the average relative error of 200 samples from a Exponential distribution.
Format: PDF Size: 68KB Download file
This file can be viewed with: Adobe Acrobat Reader
Additional File 5:
Weibull Distribution. The top row of the table displays the results of estimating the mean, while the second row displays the results of estimating the standard deviation. Each number in this table represents the average relative error of 200 samples from a Weibull distribution.
Format: PDF Size: 69KB Download file
This file can be viewed with: Adobe Acrobat Reader